Recent Topics
New oil additive saves 2% on gas
by bigt61
08/01/14 06:52 AM
Pennzoil Ultra Platinum - HTHS and TBN
by vinu_neuro
08/01/14 06:15 AM
streaming live sports
by sleepery
08/01/14 05:23 AM
8/1-8/31 NAPA Dollar Days
by tenderloin
08/01/14 01:52 AM
PP 0w-20 7,400 mi. 2013 Subaru Forester FB25
by Bandito440
08/01/14 12:57 AM
Laboratory Analysis of MMO
by MolaKule
07/31/14 11:22 PM
Old hang on window a/c maintenance......
by daves66nova
07/31/14 11:12 PM
best flashlight batteries?
by Chris142
07/31/14 10:54 PM
Possible sludged VQ37HR
by aualtima3.5
07/31/14 10:41 PM
"Gravel Traps"
by simplistic
07/31/14 10:23 PM
Transmission clunk, I cannot figure it out!
by Klutch9
07/31/14 09:56 PM
The 15,000 Mile OCI
by macarose
07/31/14 09:40 PM
Newest Members
jdfay, kaesees, bprat318, Winter_Texan, SloopJohnB
50816 Registered Users
Who's Online
67 registered (2010_FX4, 05LGTLtd, 94astro, A_Harman, AdmiralYoda, Astro14, 8 invisible), 1045 Guests and 213 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
50816 Members
64 Forums
217141 Topics
3419197 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG

Topic Options
#2835370 - 12/14/12 09:14 PM 1985 BMW 318i with M42 engine swap - oil suggest?
irish44j Offline


Registered: 09/26/06
Posts: 18
Loc: Burke, VA
I just swapped an M42 engine (from a later 318is) into my old 318i (used to have an M10).

Engine has been heavily refreshed but didn't rebuild, and using original pistons/valves, etc.

Mileage unknown, but compression is within factory spec.

Car is used primarily for rallycross from March to November, but also driven to events (about 70 miles highway) and driven on weekends for fun. I drive it hard. Almost always. This car isn't for leisurely cruising smile

I'm near Washington DC, but car is driven in the hot summer and cold winter here and there. Don't mind using different viscosities/oil seasonally though....

For my WRX I use Rotella T5 and/or T6 (depending on what's on sale), which I can get at wally-world of course.

Any suggestions on the best oil for the M42 in the BMW?

Top
#2835403 - 12/14/12 10:15 PM Re: 1985 BMW 318i with M42 engine swap - oil suggest? [Re: irish44j]
Seventh Offline


Registered: 11/11/12
Posts: 50
Loc: NorCal
Do you have an oil pressure gauge?

I ask because I've seen a few <200k mi M42/44 engines that would get some oil light flickering action in hot weather traffic while running a 30wt oil. I've also seen them go 300k mi on a strict diet of 20w-50 conventional... but sounding like a diesel.

Considering how you drive the car, I'd be inclined to recommend just using the T6 for simplicity's sake since you're already using it. Watch consumption and pressure if you can, and do a UOA or two to see if things look ok. I can't imagine they won't.
_________________________
'11 WRX E85 convert-31k-Eneos 5w40
'95 325i-commuter-176k-Caterham twist-UOA in 9k
'96 332ti-133k-DELO 5w40
'69 GTO 428ci-DELO 15w40
'58 F100 331ci-T5

Top
#2835415 - 12/14/12 10:33 PM Re: 1985 BMW 318i with M42 engine swap - oil suggest? [Re: irish44j]
JHZR2 Offline



Registered: 12/14/02
Posts: 33299
Loc: New Jersey
Rotella 5w40 is a great choice and Ive used it for years in my M42 in my 1991.

M1 HM 10w-40 is also a robust ACEA A3 oil that you might consider.

Top
#2835441 - 12/14/12 11:09 PM Re: 1985 BMW 318i with M42 engine swap - oil suggest? [Re: JHZR2]
irish44j Offline


Registered: 09/26/06
Posts: 18
Loc: Burke, VA
Thanks. Seventh - it will have an oil pressure gauge once I'm done with this swap and actually driving the car again.

Since I don't put many miles on the car so my OCI is pretty long, sounds like T6 will be the way to go, else t5. Thanks.

Top
#2835447 - 12/14/12 11:21 PM Re: 1985 BMW 318i with M42 engine swap - oil suggest? [Re: irish44j]
JHZR2 Offline



Registered: 12/14/02
Posts: 33299
Loc: New Jersey
I wouldnt run T5 in it. IMO 30wt is a bit too light for the engine.

There was a time when MB for example would spec the HD or more robust version of the oils and only allow the lighter variant for really low temperatures, when the oils were low viscosity (like a 30wt).

In older manuals, 30wt is only allowable at really cold temps, in newer ones, 30wt was allowed only at really low temperatures, unless it was what is now the precusror to ACEA A3.

So if the HTHS of T5 is high enough to qualify for ACEA A3, you might consider using it... But Im not sure it would meet this.

Your selection aligns to this:



SPecial oils are in my interpretation, wider viscosity synthetics, but the basic premise of 40 or 50wt still stands.

Top
#2835465 - 12/15/12 12:44 AM Re: 1985 BMW 318i with M42 engine swap - oil suggest? [Re: irish44j]
dparm Offline


Registered: 04/19/10
Posts: 12366
Loc: Chicago, IL
I would run any quality 5w40 and call it a day. T6 is a good value oil, as are pretty much any of the other 5w40 HDEOs.
_________________________
2011.5 BMW M3 saloon ZCP
der stärkste buchstabe der welt
Castrol Edge Professional TWS 10w60 + Mahle OX 254D3

Top
#2835574 - 12/15/12 07:27 AM Re: 1985 BMW 318i with M42 engine swap - oil suggest? [Re: irish44j]
fdcg27 Offline


Registered: 09/25/09
Posts: 8988
Loc: OH
Mine seems to do very well with Maxlife 10W-40.
Either the green or the red bottle would be appropriate.
I had a very good UOA using Maxlife Nextgen 10W-40 for 4K last summer.
_________________________
12 Accord LX 22K HGMO 0W-20
09 Forester 64K PU 5W-30
02 Accord 127K G-Oil 5W-30
01 Focus ZX3 98K Synpower 10W-30
95 BMW 318iC 146K Defy 10W-40

Top
#2835698 - 12/15/12 10:27 AM Re: 1985 BMW 318i with M42 engine swap - oil suggest? [Re: irish44j]
KCJeep Offline


Registered: 06/30/11
Posts: 4458
Loc: Mahzurrah!
The Rotella 30 wts have an HTHS of 3.5, on the thick side for 30's and right at the level recommended for many German cars, but I wouldn't run a generic PCMO 30 in it the HTHS would be 3.0-3.1 for most of them.
_________________________
2004 Jeep Grand Cherokee 4.0 @ 121k Pennzoil HM 10w30
Napa Silver 31515
KIA Sedona 37k, Chevy Lumina 169k, Chrysler Sebring 170k, Ford Ranger 174k!

Top
#2835734 - 12/15/12 11:12 AM Re: 1985 BMW 318i with M42 engine swap - oil suggest? [Re: KCJeep]
Seventh Offline


Registered: 11/11/12
Posts: 50
Loc: NorCal
Originally Posted By: KCJeep
The Rotella 30 wts have an HTHS of 3.5, on the thick side for 30's and right at the level recommended for many German cars, but I wouldn't run a generic PCMO 30 in it the HTHS would be 3.0-3.1 for most of them.


T5 is a great oil, and I completely agree with this statement, however the oil light flickering I spoke about was on M42/44 cars running the BMW synthetic, which is also 3.5 HTHS.

He will be better informed with pressure and temp gauges, but I still wouldn't run any 30wt oil in that car during warmer months if it's getting thrashed like the he suggests. $.02
_________________________
'11 WRX E85 convert-31k-Eneos 5w40
'95 325i-commuter-176k-Caterham twist-UOA in 9k
'96 332ti-133k-DELO 5w40
'69 GTO 428ci-DELO 15w40
'58 F100 331ci-T5

Top
#2835916 - 12/15/12 02:36 PM Re: 1985 BMW 318i with M42 engine swap - oil suggest? [Re: irish44j]
OVERKILL Offline


Registered: 04/28/08
Posts: 25680
Loc: Ontario, Canada
M1 0w40 or D1 5w40 would be good choices as well here.
_________________________
Network Engineer
02 Expedition
01 BMW ///M5
05 Forester XT

Top